Breaking flavor democracy with symmetric perturbations

Ghosh, Tathagata; Liao, Jiajun; Marfatia, Danny; Yanagida, Tsutomu T.

doi:10.1016/j.physletb.2018.08.062

Title: Breaking flavor democracy with symmetric perturbations

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Abstract

Flavor democracy broken in the fermion mass matrix by means of small perturbations can give rise to hierarchical fermion masses. We study the breaking of the S$$L\atop{3}$$×S$$R\atop{3}$$ symmetry associated with democratic mass matrices to a smaller exchange symmetry S$$L\atop{2}$$×S$$R\atop{2}$$ in the charged lepton, up and down quark sectors. An additional breaking of the S$$L\atop{2}$$×S$$R\atop{2}$$ symmetry is necessary for the down quark mass matrix, which yields arbitrary perturbations in that sector. On the other hand, we require the neutrino mass matrix to be diagonal at the leading order, with the perturbations left arbitrary due to the absence of any guiding symmetry. We show that the interplay between these two kinds of perturbations reproduces the quark and lepton mass and mixing observables for either hierarchy of neutrino masses.

Authors:

;

; Marfatia, Danny; Yanagida, Tsutomu T.

Publication Date:: 2018-10-01

Research Org.:: Univ. of Hawaii, Honolulu, HI (United States)

Sponsoring Org.:: USDOE Office of Science (SC), High Energy Physics (HEP)

OSTI Identifier:: 1467948

Alternate Identifier(s):: OSTI ID: 1598038

Grant/Contract Number:: de-sc0010504; SC0010504

Resource Type:: Published Article

Journal Name:: Physics Letters B

Additional Journal Information:: Journal Name: Physics Letters B Journal Volume: 785 Journal Issue: C; Journal ID: ISSN 0370-2693

Publisher:: Elsevier

Country of Publication:: Netherlands

Language:: English

Subject:: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats


                    Ghosh, Tathagata, Liao, Jiajun, Marfatia, Danny, and Yanagida, Tsutomu T. Breaking flavor democracy with symmetric perturbations.  Netherlands: N. p., 2018. 
Web.  doi:10.1016/j.physletb.2018.08.062.

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                    Ghosh, Tathagata, Liao, Jiajun, Marfatia, Danny, & Yanagida, Tsutomu T. Breaking flavor democracy with symmetric perturbations.  Netherlands.  https://doi.org/10.1016/j.physletb.2018.08.062

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                    Ghosh, Tathagata, Liao, Jiajun, Marfatia, Danny, and Yanagida, Tsutomu T. Mon .  
"Breaking flavor democracy with symmetric perturbations".  Netherlands.  https://doi.org/10.1016/j.physletb.2018.08.062.

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@article{osti_1467948,

  title        = {Breaking flavor democracy with symmetric perturbations},

  author       = {Ghosh, Tathagata and Liao, Jiajun and Marfatia, Danny and Yanagida, Tsutomu T.},

  abstractNote = {Flavor democracy broken in the fermion mass matrix by means of small perturbations can give rise to hierarchical fermion masses. We study the breaking of the S$L\atop{3}$×S$R\atop{3}$ symmetry associated with democratic mass matrices to a smaller exchange symmetry S$L\atop{2}$×S$R\atop{2}$ in the charged lepton, up and down quark sectors. An additional breaking of the S$L\atop{2}$×S$R\atop{2}$ symmetry is necessary for the down quark mass matrix, which yields arbitrary perturbations in that sector. On the other hand, we require the neutrino mass matrix to be diagonal at the leading order, with the perturbations left arbitrary due to the absence of any guiding symmetry. We show that the interplay between these two kinds of perturbations reproduces the quark and lepton mass and mixing observables for either hierarchy of neutrino masses.},

  doi          = {10.1016/j.physletb.2018.08.062},

  journal      = {Physics Letters B},

  number       = C,

  volume       = 785,

  place        = {Netherlands},

  year         = {2018},

  month        = {10}

}

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